Thailand's army has declared martial law across the country to restore order following months of anti-government protests that have left 28 people dead and hundreds wounded.An announcement on military-run television said martial law had been invoked "to restore peace and order for people from all sides", stressing that the move "is not a coup"."The public do not need to panic but can still live their lives as normal," it added.Al Jazeera's Scott Heidler reports from Bangkok.